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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657594657f7c3c247823e5f10047e997e99d785e6cdd7aa899145806837f7975' 
  AND token = '0nqA1Yu08Xgb2N5/wnvp3NM+NtltJ2mcL5mox0Wcxb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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