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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc5e65409d8915b062bdf9403470e39ef4aa330740bed4fbe09259f90b23e93' 
  AND token = '3JZ1oZ6NsMCt3IeD3U5AVfYUu2X08C5/33PrtOOptHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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