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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f10184edfa0a3e7755bbe600f8015301993ae79d51887d0b66fac3f70f1043' 
  AND token = 'asuGD5FbnVPDfj4tUs1muNRCGkwrG3cFEK3okK4te2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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