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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd118d7dfa5a02a5fee418d428b1ad4560b8ebc120256ac903cbdb8c44a8442b1' 
  AND token = 'y1sCduyDNHHag6mkMyYZGYvEnUDpQ5b9368YqAb/gjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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