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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70478ebe1a6077af4b39a851a0a8b3df625d44c5f8120de58890c1dc67a7d21f' 
  AND token = '4rvsR+YaMl0adsAe1dH66WLFgTPYmzyYs8thwqCJ2hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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