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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0702fac30805d33d73c7bb3584cb42fc77b8638ad8b460eb1794415c8ef6f2' 
  AND token = 'R4GF0vvbLuBX9mp/oDy1AhsHavX8Oel0D3Hm39bUfs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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