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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36ca1cabb1832e25a1b79d5ae90f627f0e4db9fcf7a7cb80bc72fc67a7331cc' 
  AND token = '40jS54fZFxGZXMe9kfQgFNqgD9xk1s3A6l2WDAP31Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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