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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef3cf2084e1764df7cdfa10fa5e41dd9413e740108d008d73c89a3a4061727d' 
  AND token = 'lQN0GPtRp4zTfF6CPp5Zs7h5N/UEaC+HwkvRowN3npU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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