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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cd459668a7352e53b2ce037dcfe6168fafc359b42e555dfa19c837aef479ae' 
  AND token = 'aW5P4pC0izvVf4itPKJdEae4cqD7Cv9z5TPdksrkXhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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