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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa5f16cc7da9338348b2b6c9b846e0aaf2a71ff3f957ff5d189b3c92ab49c2e' 
  AND token = 'zQtz1Pp5450ehJWw6ZdPt5D/+0Uh5baaPwRuRYqUkJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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