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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0af87319d8b425fea8a9789c16e4d0c0603af9e07e859947beaf533d05cc918' 
  AND token = 'hKlDCppsf8MblfHCTkDbiun7XMiuIx2IpWSU7AbaajE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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