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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afcb40e0c60221df5d450df523425846842d9eb02c6bfb11e64f012cd2294da2' 
  AND token = '9hl9CB2/mkXh0FH+YFe0AyQLLTSSbN2tLsLI4q0Xt70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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