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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bc61bf6ce04c22fd25a510cd57746218678f28b9d7b2ea86c09a6c4fe71489' 
  AND token = 'd9zc5HneD0VBOn9ePIgU7tS6EHRWtSedqSZAlB3zKjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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