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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed606b0ce14f7b9f3db5af0bdb0e8520654f6723a84bb52f813c609b89b6193' 
  AND token = 'etyTypgVi7U6PT9TOw9IVvo9teZimHgMV2ASUrgIMcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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