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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1386f50c16cd30673a518f0d289b2c88476fbc9cdeb2ccb3cc3d9366a3e2ba65' 
  AND token = 'dH/5FKPr4hSb1HEdBT4TGtzUk8AdOhqKPKUlBSZXpqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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