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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b197c44b9ef86fd7bb3a0448593aaca2147949f0058cfb0c5db29cf90a3427fe' 
  AND token = 'T+K/YidlNyoLY22yZxc20ce04bgpQNEmRKYvLLky3fk=' 
  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"
    }
  }
}