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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2478fc2c17aa9e5a305d29d38198cc4ae2aeff04d395e8ebed6c77d130a93d85' 
  AND token = 'Sg5D7KOlzZ1dzWymWew2xtjtlsI4cvnoTY/Afcgx/mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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