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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5caa12c2ca6dbf03018fedca316834381f1272b438199e9afd211994e713de' 
  AND token = '9qp/57Fos0lrFODMWR8XTdLJA0Fx+qk8xkG+2QMdZTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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