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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f411c8d12879d68c6d6fd0716ce3a9f2791c518e9b93ae29f6c0b943df61f541' 
  AND token = 'f5dJ3PIb00F1bL/6BeOwUgSPHB96l5JZRceFaxogWKQ=' 
  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"
    }
  }
}