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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bfe4d47efaff5d82a8d8787f4183d855fdb140780d374f977c2948f3b016b7' 
  AND token = 'ql7cr4SGbrWmjNdSLL0o8feVUpCnf/aERejNXW/7d/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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