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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d17da439b3840844c8e9bf515dca4d2acd2a92cba67a3211a1049b9436743f' 
  AND token = 'Aims88p3bwcMdI/nfnY9RjdnyKRJxwfYMCsToYKTpUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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