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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5662d9479207425f64670e4a98c5f37045602e6eb7afa70ed842b163ca2c598' 
  AND token = 'B+GeVhM6bcQF1yDJ+hvQC+djQ6QtJHCJvlYH2OkThno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}