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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64dc191b4a70a93af3a2570f3ec6ac79d8d18e22368b54fb0d212778c2944318' 
  AND token = '4lY07NEDssLztwXC97tD04TJxQVS98tTgKJiGd8ckGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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