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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1899e904b44316c51b2abf4d3f54a2342a5d4f1e1f0b1d47160ac8c3d0bab22' 
  AND token = 'Vc3hD0h4NSvgXLI9QxsSyBaCAnC+KDeSb2cD3hhu/zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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