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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c0711e692c9e268c6df7da4ebdc39d344c757835e0386662cb6d3a66ad40cc' 
  AND token = 'Lb4L9NO7m1bnenF0oRUHfipO/HtpOEqpMPkWTUBy9ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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