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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b52c8324f46de0996fe315f8e2522fd2353fca100e06b9da8ba2329afea1790' 
  AND token = 'jf1H+4B5L419sN1xbfHqZYJ9ljGz7zutqbXP3Hj41bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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