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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8d0bdf3aa4b46530c275a313361fe51657e6091f64c955ab61e80458e6ee64' 
  AND token = '9x4sMbciEYMgLfoV36PWdTdQoe4n4w9bl2eqSBsBzis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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