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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a71a28a615658219041e01dffbebec6a2dcb30e5ce608e91769973c7e7c8921' 
  AND token = 'oHPqbGyoDKJJZn12GLO4P5WA8OKyl5oT8F/6tUTtjbM=' 
  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"
    }
  }
}