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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce7e9538ff4b4751467dcf334a75b7851d40ce1de11ed66f53cab5d06122572' 
  AND token = 'B9L5+f6D+1aFBbmK98qIS3w8DkaQN7ImkxGNemND6h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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