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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b93aeaee6ebc3105209fcaad08bd764a47d6a3705a6cc66017e1d192802c805' 
  AND token = '0z3lZ7HzRorCegb28IYFR4G6I57+Yz6k8+OPK71bJ5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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