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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3842fb053b01b2180090b16e6c5daa1ed71387639ce75b5e4d7ca7a4e847fa6' 
  AND token = 'P+Fir2JeSvUfUcdl1QUp+ejXMX1AL8i5XW1yj8tBX68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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