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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f21e25dc5f18795eb2a5d0358b4c7457cf7674c338f91574b27781c4589896e' 
  AND token = 'dhHY5adSCJ9fJtLxYOAAttIkb7Zewio0LQZC5x/OGJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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