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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902e1d5183e93f71be2cb9edcc7fd552681255b2d1f56c63e86f24575af1afb5' 
  AND token = 'yMv4g9T8PZTWCJ+2IdNFXR+jE6AGgqGdNoabEi9+XNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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