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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb05097a533296f9e2526d079f81785e79fee80f0dcdb42af59204df00cf07c' 
  AND token = '4CQt7S3rrN0B+FTMb8783/zKXZn8LB5LWxkmTXnyl5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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