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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46152accc4aee5e9f242f1b914faaad3efe8659419c10dc61066e7d00f63bd71' 
  AND token = 'hR6aFYYzqc8v5y+FKva0LZ7fEhSCSrmEdPLaMhRETyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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