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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf15cb764e2efc0ec2f9d0615a7842553ab30f2adbcec2956caa4ad03667352' 
  AND token = '9sMZR94N6p9DwFeXX/Y1YOXt3ZKrfn4WGvIZpYidSUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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