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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8342f3553dce3911e228e534aedf5357e2a92eb0623a3b8d3edee9547b47cc4c' 
  AND token = 'fWD40zznStwjfd6ux40oxfHWnyn+jqA7Rbp/oA8kcWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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