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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7720e18edb46b80b463ced7de4ab5a9da5a512092ac39022e4fc46e9ae776ef2' 
  AND token = 'gGu/aFl3TBf25tyjQW2MUsZ2sXoh/ICOlh7O9hRGWms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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