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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642f5dc030fbcf64ac4af4b0da11896793559e21417684a0c409b9673eb2d890' 
  AND token = 'boH+xUULVREKinb+AUhR4LL9lI9B3sIYDGRIgta0YzM=' 
  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"
    }
  }
}