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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7233461e4aa84170b89d415df75937856031653353a3b97f2a891f86db464749' 
  AND token = '7GdVySEQaihhPEr875/gZbEcMrzomJbI5EvD4IGyO6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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