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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d021af6c1fc65574a4036fede0bd2c0b1a8087c60086e34248ea91f3608e696' 
  AND token = 'ecbhh5/IlarYehsBOpJq2jQDIkoU2EL3GT2IAbyEmQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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