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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323ad59af6e162b325eca5000a25f2106e623ec66fbf40163fc9168f3f6e9b04' 
  AND token = 'p7iBxgasoym2qccJhX8F88Yos9DIX0zClRz9sRW724M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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