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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9d9df290636337e9d3b6b378cb0e0dbc1bd4b148b36b31a1a95158a401ff7a' 
  AND token = 'gqR3TTcby1xw2QPNqWMcJ7xCqbeT0fqzRq7Gh5lFHL0=' 
  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"
    }
  }
}