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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3af1de9167223896f98680eb53a9b07347956086eb57afa6b9d28972ba27d2' 
  AND token = '6Tt4vMTsLT7WZfsvVnm82umfSWpx5Rrj7tEnOdXLuCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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