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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8734d8cc141fbcea8bff58e380c189260b5a82b0260d5980a54bfd030885b4' 
  AND token = 'a9o/P7FK2820AsNMWbnrDPuw9bvokDXZ91FQyTmoyrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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