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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b87174081e00c5d5b5afa9a69e4bec8ba29483d2a0ae47c29fc87ce16ad881e' 
  AND token = 'pMwbxEafLlDoJo+l12ty0UAVE5eohp3lbQNcAmak5v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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