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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b12d31e18e82a2793e066f8018d72b1d472eb6d4e071cfb4466647b3d69293e' 
  AND token = 'a/IPLRn9OgMSTzq+SHVAmd3ziF4l+fzcQ54Eo6kwFbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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