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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee2e6ec7fd5b05696c723ca7828a8014c9a66d444e2df45180c0cdfe53243eb' 
  AND token = 'v+HItpMJTE2ENEtlvsxx/9tNXPtl67/hfE08A6DnvAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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