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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee128f1a06a415967e54fa1f5f26ef4be6da710ed7d69cb9bd386c0b60fc299' 
  AND token = 'UFSIVKH4b1/S8w9lRgQDi0zH6znyW3P0zxjadP9zoAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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