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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1932b836377abd11bd1fe8f36605087d90b9639356179b5752b6c276b62944be' 
  AND token = 'g0g5grKll8nOWLCuWprbjDdqK+kwsr9KELpp+4BXu0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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