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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcd22fe448fd816df87f39334cbdde93554d0b34afc92b9f4616c2f76fbaaab' 
  AND token = '+h+29kWMn23r6RQOUj8ZJ1Iu2K0E2oTGxmzrRewrWlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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