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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0657acc0442f4c7938a793951860f331ab4da42d82a9ebedc1f394276f5bc0d4' 
  AND token = 'N19B3XMl3gX8iki61N/BYN0qsb/n4rCeDPNm28LK9Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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