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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76365b89c724a11d2bf407e100ba35c2f92b734e753fe0650b75ae0f986829d1' 
  AND token = 'MkJJnE9A9ObJ3oePT3kDK/7U9Gj4evdbunE8WVAVVbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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