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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba100402aaea0bdcddbbf81d9dda7e9244e3093d10f69478f25dcf51b1781d41' 
  AND token = 'DOmi2ezpCV0fq/E0i2Mj0XAs9KJruuab6MSveD4Mtn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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